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Related Experiment Videos

Two new molecular bases for the Dombrock null phenotype.

Maria Rios1, Jill R Storry, Kim Hue-Roye

  • 1Immunochemistry Laboratory, New York Blood Center, 310 East 67th Street, New York, NY 10021, USA.

British Journal of Haematology
|May 25, 2002
PubMed
Summary

Individuals with the rare Do(null) blood group phenotype lack Dombrock antigens due to specific genetic mutations. These findings explain the absence of Do glycoprotein on red blood cells (RBCs) in affected individuals.

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Area of Science:

  • Immunogenetics
  • Hematology
  • Molecular Biology

Background:

  • The Dombrock blood group system includes antigens Do(a), Do(b), Gy(a), Hy, and Jo(a).
  • The Do(null) phenotype is characterized by the complete absence of these antigens on red blood cells (RBCs).
  • Understanding the molecular basis of rare blood group phenotypes is crucial for transfusion medicine.

Purpose of the Study:

  • To investigate the molecular genetic basis of the Do(null) phenotype in two unrelated individuals.
  • To identify mutations in the DO gene responsible for the lack of Dombrock antigens.

Main Methods:

  • DNA sequencing was performed on two probands exhibiting the Do(null) phenotype.
  • Analysis focused on identifying mutations within the DO gene, including splice sites and coding regions.

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Main Results:

  • The first proband had a single nucleotide mutation (t to c) at the donor splice site of DO (IVS1 + 2t > c), leading to exon 2 outsplicing.
  • The second proband presented with a homozygous nonsense mutation (442 C > T) in exon 2, resulting in a premature stop codon (Gln148 Stop).
  • These mutations explain the absence of the Do glycoprotein on the RBCs of both individuals.

Conclusions:

  • Specific mutations in the DO gene are responsible for the Do(null) red blood cell phenotype.
  • The identified molecular defects provide a genetic explanation for the lack of Dombrock antigens.
  • These findings contribute to the understanding of blood group genetics and have implications for antibody screening and transfusion compatibility.